The Physiology of the Sieve Tube

Weatherley, P. E.; Peel, A. J.; Hill, Gillian

doi:10.1093/jxb/10.1.1

Cited by 153 publications

(12 citation statements)

References 8 publications

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“…Immediately after the termination of the plant's dormancy when bud swelling was prominent, the total nitrogen concentration was 0.2 per cent (w/v), during bud burst and appearance of the first leaves it was 0.12 per cent, during leaf maturity 0.03 per cent, and during leaf senescence 0.13 per cent. Such an increase in nitrogenous matter was also found by Hill (53) and Weatherley et al (122) after the plants had been transferred to the dark. It is obviously caused by the removal of protein nitrogen from the leaves prior to abscission.…”

Section: Identity Of Translocated Substancessupporting

confidence: 81%

“…All reports concerning sieve-tube exudates, covering a total of about 45 species, stress the complete absence of hexose even in chromatographically detectable traces ( 53,76,119,122,128,131,134) . Reports on displacement of naturally occurring translocates with C1402-labeled photosynthates agree with these fi ndings to such an extent that it seems certain that sucrose or oligosaccharides are the predominant translocated sugars (6,65,68,89,113,118).…”

Section: Identity Of Translocated Substancesmentioning

confidence: 99%

“…This has been shown in many ways and with a wide variety of plants. The last step, secretion into the sieve tubes, occurs against a concentration gradient (24,56,98,122). This is not only true for sugars, but also, particularly in the fall, for nitrogen and phosphorus com pounds (128).…”

Section: Movement Of Applied Substancesmentioning

confidence: 99%

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Transport in the Phloem

Zimmermann¹

1960

Annu. Rev. Plant. Physiol.

221

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Section: Identity Of Translocated Substancessupporting

confidence: 81%

Section: Identity Of Translocated Substancesmentioning

confidence: 99%

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Transport in the Phloem

Zimmermann¹

1960

Annu. Rev. Plant. Physiol.

221

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“…The overall concentration of sucrose in fresh bean leaf tissue is about 0·1 g/lOO g fresh weight, and the concentration of sucrose in the phloem sap is, by analogy with other species, probably about 10 g/lOO g fresh weight (Kursanov et al 1958;Swanson and El-Shishiny 1958;Weatherley, Peel, and Hill 1959). The transport of sucrose from the chlorenchyma to the phloem is, therefore, against the concentration gradient and must require the intervention of a sucrose pump.…”

Section: "Ofmentioning

confidence: 99%

The Uptake of Sucrose by Bean Leaf Tissue II. Kinetic Experiments

Vickery¹,

Mercer²

1967

Aust. Jnl. Of Bio. Sci.

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SummaryLeaf tissue of Phaseolus vulgari8 takes up sucrose from external solutions by two processes. The first is an osmotic uptake into the free space. The second is a non-osmotic uptake into the osmotic volume. The kinetics of the non-osmotic uptake, from solutions less concentrated than 0 ·lM, fit the Michaelis-Menton equation. The tissue can accumulate sucrose against its concentration gradient from solutions less concentrated than 0 ·lM. There is no significant efflux of sucrose from the tissue. The correlation of the rate of carbon dioxide droduction with the internal sucrose concentration suggests that part, at least, of the cytoplasm is included in the osmotic volume for sucrose.

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“…Assuming that the pressure flow hypothesis for phloem transport is valid, the fact that translocation occurs even under wilting conditions (Plaut and 306 z. PLAUT AND LEONORA REINHOLD Reinhold 1965) indicates that vigorous sugar secretion must take place in stressed leaves in order to build up the necessary osmotic pressure in the sieve tubes. Weatherley, Peel, and Hill (1959) showed that secretion of sugar into the sieve tubes can be maintained even when the vacuoles of the latter contain 50% sucrose.…”

Section: (D) Evolution Of 14c0 2 By Stressed and Control Plantsmentioning

confidence: 99%

The Effect of Water Stress on the Movement of [14c]Sucrose and of Tritiated Water within the Supply Leaf of Young Bean Plants

Plaut¹,

Reinhold²

1967

Aust. Jnl. Of Bio. Sci.

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SummaryWhen [140]sucrose was applied to one of the primary leaves of bean plants and the small application site subsequently removed, far higher amounts of alcohol-soluble 140 were detected in the leaves of plants under water stress than in controls. The effect could not be accounted for by translocation out of the leaf, nor by synthesis of sucrose,into non-alcohol-soluble compounds, nor by respiration. Increased movement of 14 0 out of the supply area in stressed leaves appeared to be responsible, and the mechanism of [140]sucrose transport within the leaf was therefore investigated.Subdivision of leaves into sections at brief intervals after 140 application showed that movement of sugar from the treated area was not random, but was directed towards the midvein. This pattern was independent of moisture tension. Radioautographs supported this conclusion, indicating that in both stressed and control leaves labelled sugar was not dispersed through the mesophyll but passed from the application site down a sidevein into the midvein.The effect of stress on the movement of THO in the leaf was the opposite of that on [ 14 0]sucrose, i.e. far less THO was recovered from stressed leaves after removal of the supply area. Accelerated translocation of THO out of the leaf did not account for this result. Nor did exchange with the atmosphere, since the transpiration rate of the control was at least seven times that of the stressed plants. The gradient in specific activity of THO across the leaf was considerably steeper for control than for stressed leaves.A steam girdle round the stem drastically reduced 140 movement in the leaf in both stressed and control plants. THO movement did not appear to be affected by the girdle.On the basis of the above results it was concluded that movement of applied sugar in the leaf, even over short distances from the application site; was not by capillary flow but involved phloem transport; and that one or more phases of this transport were stimulated by water stress.

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The Physiology of the Sieve Tube

Cited by 153 publications

References 8 publications

Transport in the Phloem

Transport in the Phloem

The Uptake of Sucrose by Bean Leaf Tissue II. Kinetic Experiments

The Effect of Water Stress on the Movement of [14c]Sucrose and of Tritiated Water within the Supply Leaf of Young Bean Plants

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